Julian Gregorian Calendar Converter. It’s a handy online tool that lets you convert dates from the julian calendar to the gregorian calendar (the one we use today) and back again. Use this tool to convert between date and julian (yyddd) date formats.

Enter the calendar date in the appropriate fields and then press the desired button to calculate the julian date or enter the julian date in that field and click the button to. Simply enter your julian date and let our tool do the rest.